Very high solid content aerosol delivery system

ABSTRACT

This invention concerns very high solid content aerosol adhesives and an aerosol spray device for the application of such aerosols comprising a spray can, a valve mounted to the can, a button mounted to the valve to control its opening and closing, a nozzle comprising a throughbore in fluid communication with the can interior when the valve is open. The nozzle comprises an axial throughbore, a flow restrictor being a channel having a length and a rectangularly-shaped cross section, and an exit port comprising a substantially rectangular orifice and a pair of opposing horizontal and a pair of opposing vertical walls extending and flaring outward from the orifice in the direction of the spray flow. This invention provides a very high solid content contact adhesive and an application device which provides for a substantially more uniform application of the adhesive than previously attainable.

STATEMENT OF RELATED APPLICATIONS

This Application is a Continuation-in-Part of U.S. patent applicationSer. No. 09/316,339, filed May 21, 1999 and a Continuation-in-Part ofU.S. patent application Ser. No. 09/126,383, filed Jul. 30, 1998.

FIELD OF THE INVENTION

The present invention relates to aerosol adhesive application devicescapable of spraying very high solid content aerosols, and, moreparticularly, very high solid content aerosol adhesives.

BACKGROUND OF THE INVENTION

In general, aerosol spray cans for a variety of aerosol products includea substance to be sprayed, an optional carrier fluid and a propellant.Typically, the propellant is a composition that pressurizes the can andassists in atomization of the substance being sprayed.

In the past chlorofluorcarbons (CFC's) were widely used as propellantsbut these propellants are now banned by international agreement. Inresponse, industry has been seeking ways to reduce the amounts oforganic solvents present in adhesive and other aerosol sprays.

A reduction in solvent would also produce other benefits. For Example,as the proportion of solvent present in aerosol adhesive decreases, moreof the adhesive composition itself is present in the aerosol. This meansfewer spray cans would be necessary to deliver the same amount ofadhesive saving on cost and waste management.

Thus, for example, spray can-applied adhesive/solvent mixturescontaining 20-25% by weight adhesive compound, also known as very highsolid content (VHS) adhesives, have become increasingly desirable in thefield of contact adhesives because of their use of smaller proportionsof organic solvents. Our copending U.S. patent application Ser. No.09/126,383, entitled “Very High Solids Adhesive” filed Jul. 30, 1998,which is hereby incorporated by reference, discloses such a compositionfor a VHS adhesive and a method for making the VHS adhesive. Theadhesive typically comprises a resin/rubber/solvent mixture. The resinsused typically include polyterpene resins, phenolic resins, phenolicmodified terpene resins, aliphatic petroleum hydrocarbon resins, and thelike. The rubbers used in the adhesive mixtures generally use a blend ofpolychloroprene synthetic rubbers. A wide range of solvents may be useddepending on the composition of the adhesive with which it must becompatible to form a solution. Thus, the solvents used may include,among others, various chlorinated solvents, ketones, aliphatics,aromatics, alcohols, and esters, or even inorganic solvents such aswater.

However, it has been found that in practice using VHS adhesives can bequite difficult. For example, in general, as the solid content of theadhesive increases, the viscosity of the adhesive/solvent mixtureincreases. When using standard nozzles and buttons on typical aerosolspray cans, the increased viscosity causes the spray pattern of adhesivemixture from the can to be uneven. For example, if a standard can,valve, and button (such as variable valve Model #V8-10-118, with a 906collar and button Model #166-197-1620-white, both provided byNewman-Green of Addison, Ill.) are used to spray a VHS adhesive/solventmixture having 30 wt % adhesive, such as neoprene, the spray tends to beuneven. That is, the spray pattern will have varying concentrationsacross the area of application. It is believed that this generallyoccurs because the button contains a substantially circular shaped exitport through which the VHS adhesive mixture stream passes so that thereis limited or no “fanning” of the spray; the stream exits in asubstantially straight line. Additionally, even if some outward“fanning” should occur, the fanning is not controlled and theconcentration of the sprayed fluid is not uniform and tends to varythroughout the application area.

Various nozzles for attachment to the spray buttons have been designedto try to overcome the nonuniformity of spray problem. U.S. Pat. No.4,401,272, issued to Merton et al., on Aug. 30, 1983, and U.S. Pat. No.4,401,271, issued to Hansen, on Aug. 30, 1983, each disclose nozzleswhich attach to aerosol spray can buttons. These nozzles do not appearto resolve the issue. For example, the '272 patent discloses that thenozzle is only capable of spraying mixtures with solid content levels upto 11. 1%, well below typical VHS levels. When such nozzles are used,the spray tends to be more concentrated at the top and bottom of thespray area and less concentrated near the center of the spray area. The'271 patent provides another attempt at a solution to the “nonuniformityof spray” issue.

As explained above, there is a need for a VHS adhesive/solvent mixturewith higher workable solids contents than heretofore known and a devicefor applying such a mixture substantially uniformly.

BRIEF SUMMARY OF THE INVENTION

The present invention relates to an aerosol spray device, comprising:

a spray can;

a valve mounted to the can;

a button mounted to the valve to control opening and closing of thevalve, the button having an exit port in fluid communication with aninterior of the can when the valve is open; and

a nozzle, mounted to the exit port of the button, said nozzle includinga throughbore having a flow restrictor proximate to the throughbore'sexit end and having a substantially rectangular exit port, the porthaving at least one pair of opposite walls flaring outward from the flowrestrictor at an angle of about 20 to about 75°, wherein the spray canhas an interior and the interior comprises:

(a) propellant; and

(b) an adhesive mixture comprising:

(a) 35 to 70% by weight solvent,

(b) 4 to 30 weight % resin, and

(c) 8 to 40 weight % rubber, based upon the weight of the adhesivemixture, wherein the adhesive mixture has a Brookfield viscosity of fromabout 50 to 600 cps, and a solids content of at least about 20%.

The present invention provides a very high solids application devicewhich allows substantially more uniform application of the high solidsfluid than was previously attainable. Additional aspects of the presentinvention will become evident upon reviewing the non-limitingembodiments described in the specification and the claims taken inconjunction with the accompanying figures, wherein like numeralsdesignate like elements.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a VHS adhesive spray can;

FIG. 2 is a top view of a VHS adhesive spay can;

FIG. 3 is a cross-sectional side view of an exemplary embodiment of anozzle and button of the present invention;

FIG. 4 is a side view of an exemplary embodiment of a nozzle of thepresent invention;

FIG. 5 is a top view of the present invention;

FIG. 6 is a close-up cross-sectional side view of a chamfered insertionend of the nozzle of the present invention;

FIG. 7 is a cross-sectional close-up view of the exit end of the nozzle;and

FIG. 8 is a front view of the exit end of the nozzle.

DETAILED DESCRIPTION OF THE INVENTION

The following descriptions are of preferred embodiments, and are notintended to limit the scope, applicability, or configuration of theinvention in any way. Rather, the following description provides aconvenient illustration for implementing a preferred embodiment of theinvention. Various changes may be made in the function and arrangementof elements described in the preferred embodiments without departingfrom the spirit and scope of the invention as set forth in the appendedclaims. In addition, while the following detailed description isgenerally described with respect to certain VHS adhesive mixtures, theinvention is also applicable to other higher viscosity mixtures that arepropelled or applied through an aerosol spray can. Moreover, the nozzlesof the invention are not limited to those described specifically herein,but encompass those that are equivalent to the ones described.

In the specification and claims, the term VHS refers to “very highsolids content”. Generally in the art this refers to a mixture havingabout 25% or more solids content. While the following descriptionrelates mainly to VHS adhesives, it is clear that the principlesdiscussed and devices described are also applicable to other VHSsubstances that are supplied and propelled through aerosol cans, forinstance, paints, lacquers, polishes, waxes and the like.

In a preferred embodiment, the adhesive mixture to be sprayed accordingto the invention comprises a blend of one or more rubbers, one or moresolvents and optionally one or more hydrocarbon resins. In someembodiments a rubber/solvent mixture can be used, however in otherembodiments a rubber/solvent/resin combination is used. The adhesivemixture typically comprises:

(a) 35 to 70 weight % solvent, preferably 40 to 65 weight %, preferably45 to 60 weight %, and

(b) 8 to 40 weight percent rubber, preferably 10 to 36 weight %,preferably 15 to 30 weight %, and optionally

(c) 4 to 30 weight % resin, preferably 6 to 28 weight %, preferably 8 to26 weight %, based upon the weight of the solvent, rubber and optionalresin.

Generally the adhesive mixture is then combined with a propellant andthen placed in an aerosol delivery device.

The adhesive mixtures of the present invention preferably also have alow viscosity. In general, as the solids content of a mixture increases,generally so does the viscosity of the mixture, but the “shearing”mixing method of our prior application, described below, minimizesviscosity increase with increase in adhesive content. Thus, in apreferred embodiment, the adhesive mixtures described herein also have aviscosity that is in the range of at least about 50 cps, preferablyabout 200 to about 600, preferably from 250 to 400 cps. For purposes ofthis invention, viscosity is measured according to ASTM D 1084(Brookfield viscosity, using spindle #4, 60 rpm and a temperature of 72°F., (22° C.)).

Preferred rubbers that may be used in the adhesive mixtures of thisinvention include known rubbers having a Mooney viscosity of about 30 toabout 110 as measured by ASTM D 1646 (ML1+4 at 100° C.): In anotherpreferred embodiment the rubbers preferably have high mechanicalstrength and quick green strength.

Typical rubbers include those rubbers known as polyisobutylene, (PIB ornatural rubber), polyisoprene rubber, butyl rubber, polychloroprenerubber (Neoprene or CR), styrene butadiene rubber (SBR) (both the blockand random forms), styrene isoprene styrene rubber (SIS)(both the blockand random forms), nitrile rubber (NBR) and the like. A preferredpolychloroprene rubber is a copolymer of chloroprene and 2,3dichloro-1,3 butadiene. The rubbers may be modified with functionalgroups such as acids, esters, anhydrides, alcohol, acrylate, metalcontaining groups or the like. For example, a rubber, such as neoprenerubber or nitrile rubber, that has been grafted or otherwise modifiedwith an acid or anhydride, such as maleic acid or maleic anhydride, maybe used in the practice of this invention. In preferred embodiments, twoor more of the rubbers are combined together before, during or afterbeing combined with the other components of the adhesive mixture. Insome embodiments, multiple rubbers that are variants (for example, twoneoprene rubbers, where the first neoprene has a different comonomerfrom the second neoprene rubber), are combined together before, duringor after being combined with the solvent and optional resin. Anon-limiting example would be compounding a first polychloroprene rubberhaving a comonomer of 2,3 dichloro-1,3 butadiene with a secondpolychloroprene rubber having comonomer of sulfur or methacrylic acid,and thereafter combining the two compounded rubbers with the solvent andoptional resin in the shear mixing operation discussed below. As anadditional option one could then add a third similar or different rubber(such as another polychloroprene) during the shear mixing.

In one preferred embodiment the rubber comprises one or more neoprenerubbers and the rubber is present at 10 to 35 weight %, preferably 15 to35 weight %, even more preferably at 19-30 weight % based upon theweight of the adhesive mixture.

Preferred solvents for use in the adhesive mixture include anyhalogenated solvents, such as chlorinated solvents, ketones, aliphatics,aromatics, alcohols, esters, water, and mixtures thereof. In a preferredembodiment the solvent comprises one or more of acetone, toluene,cyclohexane, hexane, pentane, di-methyl ether and the like. In aparticularly preferred embodiment the solvent comprises a mixture ofacetone, toluene cyclohexane, hexane, pentane and dimethyl ether.

Preferred resins for use in the adhesive mixture include any natural orsynthetic resin, petroleum resins, polar or non-polar hydrocarbon resin,polyterpenes, phenolic resins, phenolic modified terpene resins,aliphatic aromatic hydrocarbon resins, and aliphatic petroleumhydrocarbon resins, and the like. Preferred resins have a ring and ballsoftening point of about 25° C. to about 180° C., preferably 25 to 135°C., preferably 50 to about 135° C., as measured according to ASTM E-28.

The adhesive mixture may also comprise optional additives known in theart. Preferred additives include, antioxidants, UV stabilizers,colorants, dyes, pigments, fillers, lubricants, plasticizers, cureagents, cross-linking agents, and surfactants. Preferred examplesinclude metal oxides, such as magnesium oxide and/or zinc oxide. Withoutwishing to be bound by any theory it is believed that the metal oxidesaid in stabilization by neutralizing hydrochloric acid that is releasedas polychloroprene ages and may also aid in increasing tensile strengthby acting as a curing/crosslinking agent. In a preferred embodiment theadditives are present in amount from 0.5 weight % to 5 weight %,preferably from about 1 to about 4 weight %, more preferably from about1.5 to 3 weight %, based upon the weight of the total adhesive mixture.Preferred antioxidants include phenols, phosphites, thioesters, amines,polymeric hindered phenols, copolymers of 4-erthyl phenols, reactionproduct of dicyclopentadiene and butylene and mixtures thereof.Preferred antioxidants include phenyl-alpha-naphthylamine,phenyl-beta-naphthylamine, phenyl-beta-naphthylene, 2,2′-methylene bis(4-methyl-6-tertiary butyl phenol), Irganox™ 1010 (available from CibaGeigy) and the like.

The adhesive mixtures described above may be formed using any one ofmany useful processes, including for example the shearing mixing processdisclosed in U.S. Pat. No. 5,733,961 to Purvis II, et al., issued Mar.31, 1998, which is hereby incorporated by reference. The shearing isgenerally done using a Microfluidizer® processor (made by MicrofluidicsInternational Corp. of Newton, Mass.) utilizing an electrically driven,dual plunger or piston, hydraulic Intensifier pump which pressurizes thefluid product or similar device. The rubber and solvent are mixed in akettle process and the Microfluidizer® suitably moves a stream of themixture at extremely large pressures and speeds. The stream is thensuitably split in two parts, its direction changed and cause to collidewith itself in rapid succession. The process creates shearing, impactand cavitation effects within the mixture. These effects dramaticallyreduce the size of particles within the mixture, thereby lowering theviscosity of the mixture and enabling additional rubber to be introducedto the mixture. Accordingly, the weight percentage of therubber/solvent/optional resin mixture may be increased into even highersolid content ranges than previously thought possible without undulyincreasing the viscosity of the mixture. Multiple rubbers may beintroduced into the mixing method described herein. The multiple rubbersintroduced into this shearing mixture may be the same or different.Resin and other additives may also be introduced into the shear mixingat any point in the process. Preferably, the resin and/or additives suchas stabilizers, surfactants, anti-oxidants and the like, are introducedtowards the end of the mixing process.

Once the rubber/solvent and optional resin are mixed to form theadhesive mixture, the solids content of the adhesive mixture ispreferably 20 weight % or more, preferably 28 weight % or more even morepreferably from 20 to 55 weight %, more preferably from 30 to 55 weight%, based upon the weight of the adhesive mixture. Solids content ismeasured by heating a 1 gram sample of the adhesive at 250° F. (121° C.)for 10 minutes. After the 10 minutes remove the sample from the heat andlet cool for 2 minutes. Weigh the sample. Multiply the weight in gramsby 100 to get the percent solids. For example if the sample weight is0.5 grams after heating and cooling, 0.5×100 equals 50. Therefore thesample had 50% solids.

The adhesive mixture is then preferably combined with propellant andplaced in pressurized delivery container, such as an aerosol can. Thesolids content of the adhesive mixture and the propellant in thecontainers is preferably 5 to 35 weight %, preferably 10 to 30 weight %,more preferably 15-25 weight % based upon the weight of the container'scontents. Preferred propellants include dimethyl ether, C₁ to C₄ alkanes(such as propane, isobutane, butane, cyclobutane, and the like), anyinert gases (such as nitrogen), carbon dioxide, air, refrigerants (suchas 134a, 134b, 152a, available for Dupont Chemical or Allied Signal),hydrochlorofluorocarbons, hydrofluorocarbons and the like. In apreferred embodiment the propellant is a mixture of two or more of theabove.

A particularly preferred delivery system for spraying the adhesivemixture utilizes an aerosol can, and includes the use of a propellant.With reference to FIGS. 1 and 2, in accordance with a preferredembodiment of the present invention, spray device 10 is capable ofsubstantially uniformly applying a coating of the adhesive mixture to asubstrate. In the present embodiment, spray device 10 is an aerosolspray can comprised of a can 12, a valve 14 at an upper end of can 12, abutton 16 mounted to valve 14 to open the valve, and a nozzle 18 fittedto the button, as explained below. Can 12 is generally any suitablepressurizable aerosol spray can capable of containing the VHS, solventand propellant mixture. Valve 14 may suitably be any conventionalaerosol spray can valve, though, in accordance with the presentpreferred embodiment, valve 14 may be selected from variable valve Model#V8-10-118 and equivalent valves, with a 906 or equivalent collar bothprovided by Newman-Green of Addison, Ill. Variable valve 14 allows theadjustment of the flow rate through valve 14, button 16 and nozzle 18 byrotation of button 16 around can 12. In the present preferred embodimentvalve 14 suitably contains markings designating “low”, “medium” and“high” rates of flow which aid in the determination of the flow ratethrough valve 14. Button 16 is any suitable conventional aerosol spraycan button, and, in accordance with the present exemplary embodiment maybe selected from Model #166-197-1620-white button, also provided byNewman-Green, and its equivalents.

With reference now to FIGS. 3-5, the illustrated embodiment of thenozzle 18 of the invention is configured as an elongated body memberformed from any material resistant to any corrosive or other deleteriouseffects of the adhesive mixture and should itself not contaminate thefluid being sprayed. For example, inert plastic, metals and the like.

In accordance with the present preferred embodiment of the presentinvention, nozzle 18 is adapted for use with button 16. For example,according to one aspect of the present exemplary embodiment, thesubstantially cylindrical or tapered shape of nozzle 18 has an insertionend 22 and an adhesive spray exit end 30. In the present embodiment,nozzle 18 has a diameter of approximately 0.120 in. (3.05 mm) Insertionend 22 is suitably sized for mounting to a button exit port 20 for fluidcommunication between the port and the throughbore 26 of the nozzle 18when valve 14 is open. In accordance with the illustrated embodiment,nozzle 18 is either releasably or permanently press fit into button exit20 of button 16. However, alternatively, insertion end 22 may be mountedto button exit port 20 by other means, including helical threading,adhesives and the like. Also, the nozzle 18 may be integrally formed onbutton 16 to produce a one-piece button with nozzle 18. Additionally,with momentary reference to FIG. 6, insertion end 22 may optionallyinclude a chamfer 24 formed by an angle a in order to facilitate themounting of insertion end 22 to exit port 20 of button 16. For examplein the present exemplary embodiment, chamfer 24 is about 0.0125 in.(0.32 mm) deep and angle a is about 45°.

In accordance with another aspect of the present invention, and withreference now to FIG. 7, nozzle 18 is suitably configured with all axialthroughbore or cannula 26 extending lengthwise therethrough. Throughbore26 is of substantially uniform diameter along a major portion of itslength but has a flow restrictor 28 near its exit end 30. The restrictor28 results in a reduction in cross sectional area for fluid flow throughnozzle 18, causing a decrease in fluid pressure in restriction 28. Inaccordance with the present exemplary embodiment, the ratio of thecross-sectional area for fluid flow of throughbore 26 to thecross-sectional fluid flow area of restrictor 28 is preferably about 2to about 6, more preferably 4 to 6, even more preferably 4 to 5. In aparticularly preferred embodiment the ratio is about 4.7.

Beyond restrictor 28 the tip of nozzle 18 assumes a substantiallyrectangular shaped exit port and has at least one pair of opposedsidewalls that flare outwardly towards the exit end 30 as describedbelow.

In accordance with various aspects of the present invention, thediameters (or cross-sectional area for fluid flow) of the majorthroughbore portion 26 and restrictor 28 suitably vary depending onfactors such as the solid content of the adhesive mixture passingthrough nozzle 18, the viscosity of the adhesive mixture, the intendedconcentration of the sprayed adhesive, and the desired spray pattern. Inthe present exemplary embodiment, the major throughbore portion 26suitably has a diameter of about 0.062 in. (1.57 mm) and flow restrictor28 has a substantially rectangular shape with a long side 46 and a shortside 48. In the present exemplary embodiment, long side 46 is preferablyabout 0.040 in. (1.02 mm) and short side 48 is preferably about 0.016in. (0.41 mm).

Additionally, in accordance with the present exemplary embodiment, asthe viscosity of the adhesive mixture decreases, the cross-sectionalarea of restrictor 28 also may be decreased, while, as the viscosity ofthe adhesive mixture increases, the crosssectional area of restrictor 28desirably increases. For example, if the viscosity of the adhesivemixture decreases to 50 cps, the cross-sectional area for fluid flow ofrestrictor 28 may be decreased about 20% relative to the area based onthe preferred dimensions described above. On the other hand, if theviscosity of the adhesive mixture increases to 400 cps, thecross-sectional area for fluid flow of restrictor 28 may be up to about30% larger than the area based on the above described dimensions.

According to another aspect of the present exemplary embodiment, tofacilitate fluid flow and maintain a uniform flow pattern, throughboreportion 26 preferably transitions gradually to the narrower throat ofrestrictor 28. This may be achieved by curving the terminal end of majorportion 26 uniformly inward in a radius of curvature 34 to form thewalls of the preferred substantially rectangular exit port. The radiusis about 0.0302 in. (0.77 mm) with a center 36 that is located 0.0503in. (1.28 mm) from exit end 30, along a centerline 38 of throughbore 26.Preferably the radius is from 0.28 inches (0.7 cm) to about 0.032 inches(0.08 cm). Preferably the center is located at from 0.048 inches (0.12cm) to about 0.053 inches (0.14 cm) from the exit end.

In accordance with another aspect of the present exemplary embodiment,and with reference to FIG. 8, an exit port 40 is suitably provided atexit end 30 of nozzle 18. Exit port 40 is suitably formed in a shapedesigned to facilitate spreading of the aerosol spray exitingtherethrough into a fan shape. The preferred exit port, as describedabove, is of a substantially rectangular shape, with vertical opposedsides longer than horizontal sides. Exit port 40 is suitably formed withan outward flare from the restrictor 28 that has at least one pair ofopposing sidewalls that form the upper and lower walls 42, 44 of therectangular shaped port 40 that facilitate shaping of the spray.Sidewalls 42 a, 44 a flare outward at an angle β which suitably widensfrom starting points 42 a. 44 a on restrictor 28 to the nozzle face ortip to direct the spray. The angle β is preferably 20° to 75°, morepreferably 30 to 55°, more preferably 40 to 50°.

In the embodiment shown, for an adhesive mixture of viscosity about 200cps, an Angle β of about 20° to 75° is operable, and about 45° ispreferred, while the length of a flare exit long side 50 is about 0.0471to 0.1125 in. (1.20 to 2.86 mm), and preferably about 0.0663 in. (1.68mm). In a preferred embodiment the flare angle may vary by ±0.003 inches(0.008 cm). When the viscosity is greater or smaller, experimentaltesting of β angles will lead to selection of an optimum flare angle.

The invention described herein is useful for applying the adhesivemixture to wood, laminates, paper, glass, carbon filter, concrete,ceramics, metals, steel, cloth, composites, plastics, vinyl, rubbers,cardboard, particle board, plywood, fiberboard (such as medium densityfiberboard) and the like.

Thus, while the principles of the invention have been described inillustrative embodiments, many combinations and modifications of theabove-described structures, arrangements, proportions, the elements,materials and components, used in the practice of the invention inaddition to those not specifically described may be varied andparticularly adapted for a specific environment and operatingrequirement without departing from those principles.

All documents described herein are incorporated by reference herein,including any priority documents, parent applications and/or testingprocedures.

What is claimed is:
 1. An aerosol spray device, comprising: (a) a spraycan, wherein the spray can has an interior comprising: (i) propellant;and (ii) an adhesive mixture comprising: (a) 35 to 70% by weightsolvent; (b) 4 to 30 weight % resin; and (c) 8 to 40 weight % rubber,based upon the weight of the adhesive mixture, wherein the adhesivemixture has a Brookfield viscosity of from about 50 to 600 cps, and asolids content of at least 20%; (b) a valve mounted to the can; (c) abutton mounted to the valve to control opening and closing of the valve,the button having an exit port in fluid communication with an interiorof the can when the valve is open; and (d) a nozzle coupled to the exitport of the button, the nozzle comprising: (i) an elongate body; (ii) anaxial throughbore extending through said elongate body and coupled witha flow restrictor; (iii) the flow restrictor being a channel having alength and a rectangularly-shaped cross section, and further coupled toan exit port; (iv) the exit port comprising a substantially rectangularorifice and further comprising a pair of horizontal opposing walls and apair of vertical opposing walls, wherein at least one of said pair ofwalls flares outward from the orifice to a nozzle exit end.
 2. Theaerosol spray device of claim 1 wherein at least one of said pair ofopposing walls flares outward at an angle of about 20° to about 75°. 3.The aerosol spray device of claim 1 wherein the walls flare outward atan angle of 30 to 55°.
 4. The aerosol spray device of claim 1 whereinthe walls flare outward at an angle of 40 to 50°.
 5. The aerosol spraydevice of claim 1 wherein a ratio of a cross-sectional area of saidthroughbore to a cross-sectional area of said restrictor is about 2 toabout
 6. 6. The aerosol spray device of claim 1, wherein the adhesivemixture has a Brookfield viscosity of about 50 to 400 cps.
 7. Theaerosol spray device of claim 1, wherein the adhesive mixture has aBrookfield viscosity of about 200 to 400 cps.
 8. The aerosol spraydevice of claim 1, wherein the resin has a ring and ball softening pointof about 25° C. to about 180° C.
 9. The aerosol spray device of claim 1wherein the resin comprises natural or synthetic resin, petroleumresins, polar or non-polar hydrocarbon resin, polyterpenes, phenolicresins, phenolic modified terpene resins, aliphatic aromatic hydrocarbonresins, and/or aliphatic petroleum hydrocarbon resins.
 10. The aerosolspray device of claim 1 wherein the solvent comprises one or more ofhalogenated solvents, ketones, aliphatics, aromatics, alcohols, esters,or water.
 11. The aerosol spray device of claim 1 wherein the rubber hasa Mooney viscosity of 30-110.
 12. The aerosol spray device of claim 1wherein the rubber comprises one or more of polyisobutylene rubber,butyl rubber, polyisoprene rubber, polychloroprene rubber, styrenebutadiene rubber, styrene isoprene styrene rubber, or nitrile rubber.13. The aerosol spray device of claim 1 wherein the resin is present at6 to 28 weight % and has a Ring and Ball softening point of 25 to 135°C., the solvent comprises one or more of acetone, toluene, cyclohexane,hexane, pentane, and di-methyl ether and is present at 40 to 65 weight%, the rubber comprises polychloroprene and is present at 10 to 36weight %, and the adhesive mixture has a solids content of 30 to 55weight % and a Brookfield viscosity of about 200 to about 400 cps. 14.The aerosol spray device of claim 1 wherein the adhesive mixture furthercomprises about 0.5 to about 5.0 weight % of one or more metallicoxides, based upon the weight of the adhesive mixture.
 15. The aerosolspray device of claim 1 wherein the adhesive mixture has a solidscontent of 28 to 55 weight %.
 16. The aerosol device of claim 1 whereinthe propellant comprises one or more of nitrogen, carbon dioxide, air,refrigerant, hydrofluorocarbon, hydrochlorofluorocarbon, dimethyl ether,propane, isobutane, butane, and cyclobutane.
 17. The aerosol device ofclaim 1 wherein the solids content of the combination of the propellantand the adhesive mixture is 5 to 35 weight %, based upon the weight ofthe aerosol device's contents.
 18. The aerosol device of claim 1 whereinthe rubber comprises one or more neoprene rubbers and is present atabout 19-30 weight %.
 19. The aerosol device of claim 1 wherein theadhesive mixture further comprises one or more additives selected fromthe group consisting of antioxidants, UV stabilizers, colorants, dyes,pigments, fillers, lubricants, plasticizers, cure agents, cross-linkingagents, and surfactants.
 20. The aerosol device of claim 1 wherein: (a)at least one of said pair of walls flares outward from the orifice at anangle of 40° to 50°; (b) a ratio of a cross-sectional area of saidthroughbore to a cross-sectional area of said flow restrictor is about 4to about 5; (c) the adhesive mixture has a Brookfield viscosity of about250 to 400 cps and a solids content of 30 to 55 weight %; (d) the resinis present at 8 to 26 weight %, has a ring and ball softening point ofabout 25° C. to about 180° C. and comprises natural or synthetic resin,petroleum resins, polar or non-polar hydrocarbon resin, polyterpenes,phenolic resins, phenolic modified terpene resins, aliphatic aromatichydrocarbon resins, and/or aliphatic petroleum hydrocarbon resins; (e)the solvent is present at 45-60 weight % and comprises one or more ofhalogenated solvents, ketones, aliphatics, aromatics, alcohols, esters,or water; (f) the rubber is present at 15 to 30 weight %, has a MooneyViscosity of 30-110 and comprises one or more of polyisobutylene rubber,butyl rubber, polyisoprene rubber, polychloroprene rubber, styrenebutadiene rubber, styrene isoprene styrene rubber, or nitrile rubber;(g) the adhesive mixture further comprises about 1.5 to about 3.0 weight% of metallic oxide, based upon the weight of the adhesive mixture, (h)the propellant comprises one or more of nitrogen, carbon dioxide, air,refrigerant, hydrofluorocarbon, hydrochlorofluorocarbon, dimethyl ether,propane, isobutane, butane, and cyclobutane; and (i) the solids conentof the combination of the propellant and the adhesive mixture is 5 to 35weight % based upon the weight of the aerosol device's contents.